﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp5
{
    class StringUtil
    {
        public static Boolean instrument(string str)
        {
            if (str == null || str == "" || str == "n/t")
            {
                Console.WriteLine("true");
                return true;
            }
            else

            {
                Console.WriteLine("false");
                return false;
            }


        }
    }
}
